Android使用ListView实现下拉刷新及上拉显示更多的方法

概述本文实例讲述了Android使用ListView实现下拉刷新及上拉显示更多的方法。分享给大家供大家参考，具体如下：

本文实例讲述了AndroID使用ListVIEw实现下拉刷新及上拉显示更多的方法。分享给大家供大家参考，具体如下：

今天得需求是做ListvIEw+上下拉动在header和footer显示progressdialog，但不影响用户 *** 作

直接上代码，我已经加上注释了，自己看。

package com.stay.main;import java.net.httpURLConnection;import java.util.ArrayList;import java.util.HashMap;import org.Json.JsONObject;import androID.app.Activity;import androID.app.ProgressDialog;import androID.graphics.drawable.Drawable;import androID.os.Bundle;import androID.os.Handler;import androID.os.HandlerThread;import androID.os.Looper;import androID.os.Message;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.Widget.AbsListVIEw;import androID.Widget.AbsListVIEw.OnScrollListener;import androID.Widget.button;import androID.Widget.linearLayout;import androID.Widget.ListVIEw;import androID.Widget.relativeLayout;import androID.Widget.TextVIEw;import com.stay.wifi.R;/** * @author Stay * 动态加载ListvIEw数据，上拉 刷新，下拉 更多 */public class ListVIEwActivity extends Activity implements OnScrollListener {  private static final int LOAD = 0;  private static final int ERROR = 0;  private static final int MEMBER = 1;  private static final int LOADED = 2;  private static final int DIALOG = 3;  private static final int FulL = 4;  private NearbyAdapter adapter;  private ListVIEw nearby_lv;  private relativeLayout nearby_lv_header;  private button List_bottom_btn;  private linearLayout List_bottom_linear;  private TextVIEw bottom_progress_text;  private relativeLayout nearby_lv_footer;  private button List_header_btn;  private linearLayout List_header_linear;  private TextVIEw heard_progress_text;  private ArrayList<JsONObject> nearby_data = new ArrayList<JsONObject>();  private int lastItem;  private HashMap<String,Drawable> imageCache;  private com.stay.main.ListVIEwActivity.MyHandler myHandler;  private ProgressDialog dialog;  private int curPage = 1;  private boolean isMember = false;  private int firstItem;  public int count;  /** Called when the activity is first created. */  @OverrIDe  public voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.main);    initVIEw();    myHandler.sendEmptyMessage(LOAD);  }  @OverrIDe  public voID onScrollStateChanged(AbsListVIEw vIEw,int scrollState) {    DeBUGUtil.deBUG("onScrollStateChanged");    //当滚动停止且滚动的总数等于数据的总数，去加载    if (lastItem == count && scrollState == SCRolL_STATE_IDLE) {      DeBUGUtil.deBUG("onScrollStateChanged--------next");      if (curPage == 4 && !isMember) {        DeBUGUtil.show(this,"您不是正式会员，请申请正式会员，");        List_bottom_linear.setVisibility(VIEw.GONE);      } else {        //加载数据        myHandler.sendEmptyMessage(LOAD);      }      return;    }    //当往上拉时更新数据，将data清空然后去重新加载    if (firstItem == 0 && scrollState == SCRolL_STATE_IDLE) {      DeBUGUtil.deBUG("onScrollStateChanged--------refresh");      curPage = 0;      myHandler.sendEmptyMessage(LOAD);    }  }  @OverrIDe  public voID onScroll(AbsListVIEw vIEw,int firstVisibleItem,int visibleItemCount,int totalitemCount) {    DeBUGUtil.deBUG("firstVisibleItem=" + firstVisibleItem);    DeBUGUtil.deBUG("visibleItemCount=" + visibleItemCount);    DeBUGUtil.deBUG("totalitemCount=" + totalitemCount);    //这里要减二，因为我加了header footer    lastItem = firstVisibleItem + visibleItemCount - 2;    firstItem = firstVisibleItem;  }  public int getData() {    try {      httpURLConnection conn = DownloadUtil.download(url//自己写咯);      ArrayList<JsONObject> temp = JsONUtil.streamToJsonList(conn.getinputStream());      if (curPage == 0 && nearby_data.size() > 0) {        nearby_data.clear();        count = 0;      }      if (temp != null && temp.size() > 0) {        count += temp.size();        nearby_data.addAll(temp);        DeBUGUtil.deBUG("nearby_data.size()="+nearby_data.size());      } else {        return FulL;      }      return LOADED;    } catch (Exception e) {      return ERROR;    }  }  private Handler handler = new Handler() {    @OverrIDe    public voID handleMessage(Message msg) {      super.handleMessage(msg);      switch (msg.what) {      case DIALOG:        List_bottom_linear.setVisibility(VIEw.VISIBLE);        List_header_linear.setVisibility(VIEw.VISIBLE);        break;      case LOADED:        List_bottom_linear.setVisibility(VIEw.GONE);        List_header_linear.setVisibility(VIEw.GONE);        curPage++;        adapter.notifyDataSetChanged();        break;      case ERROR:        DeBUGUtil.deBUG("error,missing data");        break;      case MEMBER:        DeBUGUtil.deBUG("you must regist formal member");        break;      default:        break;      }    }  };//创建子线程加载数据，然后更新  private class MyHandler extends Handler {    private int status;    public MyHandler(Looper looper) {      super(looper);    }    @OverrIDe    public voID handleMessage(Message msg) {      synchronized (this) {        switch (msg.what) {        case LOAD:// get data from server          handler.sendEmptyMessage(DIALOG);//显示等待框          status = getData();          handler.sendEmptyMessageDelayed(status,1000);          break;        default:          break;        }      }    }  }  public voID initVIEw() {    imageCache = new HashMap<String,Drawable>();    HandlerThread handlerThread = new HandlerThread("nearby");    // 在使用HandlerThread的getLooper()方法之前，必须先调用该类的start();    handlerThread.start();    myHandler = new MyHandler(handlerThread.getLooper());    nearby_lv = (ListVIEw) findVIEwByID(R.ID.nearby_lv);    nearby_lv_footer = (relativeLayout) LayoutInflater.from(ListVIEwActivity.this).inflate(R.layout.nearby_lv_header,null);    List_bottom_btn = (button) nearby_lv_footer.findVIEwByID(R.ID.List_bottom_btn);    List_bottom_linear = (linearLayout) nearby_lv_footer.findVIEwByID(R.ID.List_bottom_linear);    bottom_progress_text = (TextVIEw) nearby_lv_footer.findVIEwByID(R.ID.progress_text);    nearby_lv_header = (relativeLayout) LayoutInflater.from(ListVIEwActivity.this).inflate(R.layout.nearby_lv_header,null);    List_header_btn = (button) nearby_lv_header.findVIEwByID(R.ID.List_bottom_btn);    List_header_linear = (linearLayout) nearby_lv_header.findVIEwByID(R.ID.List_bottom_linear);    heard_progress_text = (TextVIEw) nearby_lv_header.findVIEwByID(R.ID.progress_text);    List_header_btn.setText("刷新");    List_bottom_btn.setText("更多");    List_header_linear.setVisibility(VIEw.GONE);    nearby_lv.addheaderVIEw(nearby_lv_header);    nearby_lv.addFooterVIEw(nearby_lv_footer);    // List_header_btn.setonClickListener(header_click);    adapter = new NearbyAdapter(ListVIEwActivity.this,nearby_data);    nearby_lv.setAdapter(adapter);    nearby_lv.setonScrollListener(ListVIEwActivity.this);  }}

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